Heat gun



FIG. 1 is a front, left and top perspective view of a heat gun showing our new design;

FIG. 2 is a rear, right and bottom perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is an enlarged view of portion 9 in FIG. 2.

The broken lines in the drawings illustrate the portions of the heat gun that form no part of the claimed design. 

CLAIM The ornamental design for a heat gun, as shown and described. 